alculate the ph of a solution that is 0.270 m in sodium formate ( hcoona ) and 0.130 m in formic acid ( hcooh ).

Answer:

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BaSO₄ is safe to ingest because of its low solubility in water and limited release of Ba²⁺ ions. The sparing solubility of BaSO₄ ensures that only a minimal amount of Ba²⁺ ions are present, reducing the risk of toxicity. This property makes BaSO₄ an effective and safe contrast agent for obtaining X-ray images of the gastrointestinal tract.

BaSO₄ (barium sulfate) is safe to ingest because it has very low solubility in water, meaning it does not readily dissolve into Ba²⁺ ions in the gastrointestinal tract. This property is crucial for its use in medicine to obtain X-ray images of the gastrointestinal tract.

When BaSO₄ is ingested, it remains mostly undissolved as a solid in the gastrointestinal tract. Only a small fraction of BaSO₄ will dissolve, leading to the release of a negligible amount of Ba²⁺ ions into the surrounding solution. The concentration of Ba²⁺ ions in the gastrointestinal tract remains extremely low due to the limited solubility of BaSO₄.

The toxicity of barium arises primarily from the presence of Ba²⁺ ions in the body, which can interfere with various physiological processes. However, since BaSO₄ does not readily dissociate into Ba²⁺ ions, the amount of toxic Ba²⁺ ions released into the body from ingested BaSO₄ is extremely minimal. As a result, the risk of toxicity or harm from ingesting BaSO₄ is negligible.

The principle that governs the limited solubility of BaSO₄ is the common ion effect. The common ion effect states that the solubility of a sparingly soluble salt is decreased in the presence of a common ion, which in this case is the Ba²⁺ ion. When BaSO₄ is ingested, the presence of Ba²⁺ ions already in the body (such as from dissolved barium salts) further decreases the solubility of BaSO₄, making it even less likely to dissolve and release toxic Ba²⁺ ions.

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The molecular formula of methyl methacrylate if its weighing 3.14 g was completely combusted and the only products formed were 6. 91 g of CO₂ and 2. 26 of water is C₅H₈O₂.

We have to determine the empirical formula of methyl methacrylate first and then multiply it by the integer n to determine the molecular formula. Empirical formula calculation:

CO₂ and H₂O are the combustion products of methyl methacrylate.

C₅H₈O₂ + (9n / 2)

O₂ → 5CO₂ + (n)H₂O

There are 5 C atoms and (8 + 2n), H atoms in the left and 5 C atoms, and n H atoms in the right.

5C = 5C, and 8 + 2n = nH.

n = 6

Molecular formula calculation is dividing the molecular weight by the empirical formula weight to determine the multiplication factor.

C₅HₙO₂ (empirical formula) has a weight of

(5 x 12.011) + (8 x 1.008) + (2 x 15.999) = 100.12 g/mol

The actual molecular weight of methyl methacrylate is 100 g/mol.

Therefore, the molecular formula is (C₅H₈O₂) x 1, which is C₅H₈O₂.

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Answer:

The immune system

Explanation:

It defends from outside pathogens that may get into the body

Answer: 115

Explanation: Given ,

    Half life of Strontium-90 = 28.8 years.

     Number of count sample(s) = 5

    Decay Sample counts  (d)= 0.3125

    Time taken for a 5-count sample to decay 0.3125 =?

    1 - First calculate (d/s) i.e (0.3125/5) = 0.0625.

   2- since its half life (1/2)^n  i.e (1/2)^n = 0.0625

     n log 0.5 = log0.0625

    n = (log0.0625/0.5) = 4.

    (1/2)^4 =(1/16)=0.0625 =>28.8 times 4 i.e 115.2 years.

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The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

free free free free free free free free free free free free free free free free free free free

Explanation:

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Answer:

this is what i got

Explanation:

During the formation of some compounds, atoms gain or lose electrons, and form electrically charged particles called ions (Figure 1). ... Atoms of many main-group metals lose enough electrons to leave them with the same number of electrons as an atom of the preceding noble gas.

Answer:

0.46M NaS₂O₃ (Assuming KIO₃ solution with a concentration of 1.0M)

Explanation:

Based on the reaction:

6 Na₂S₂O₃ + KIO₃ + 5 KI + 3 H₂SO₄ → 3 Na₂S₄O₆ + 3 H₂O + 3 K₂SO₄ + 6 NaI

6 moles of  Na₂S₂O₃ react per mole of KIO₃

Assuming the molarity of the KIO₃ solution is 0,1M:

Moles of KIO₃: = 5.0x10⁻³L ₓ (0.1 mol / L) = 5.0x10⁻⁴ moles

As 6 moles of thiosulfate reacted per mole of iodate:

5.0x10⁻⁴ moles KIO₃ ₓ (6 moles Na₂S₂O₃ /  1 mole KIO₃) =

3.0x10⁻³ moles of Na₂S₂O₃. In 6.5mL (6.5x10⁻³L):

3.0x10⁻³moles Na₂S₂O₃ / 6.5x10⁻³ L = 0.46M NaS₂O₃

Answer:

physical

Explanation:

The zinc (which was already silver) coated the penny. The NaOH dissolved the zinc. (that was what made the water murky) And small pieces of zinc adhered to the penny (coated) It was a physical change because no NEW color was created.

Standard temperature and pressure (STP) will refers to the nominal conditions in the atmosphere at sea level. These conditions are 0 degrees Celsius and 1 atmosphere (atm) of the pressure.

The standard temperature is used in STP is 0 degrees Celsius (273.15 Kelvin). The standard pressure is used in STP is 1 atmosphere (atm), which is equivalent to 101.325 kilopascals (kPa) or 760 millimeters of mercury (mmHg). At STP, the one mole of an ideal gas occupies a volume of 22.4 liters.

STP is often used in calculations involving gases, particularly in the fields of chemistry as well as physics. It provides a standard reference point for comparing and measuring the gas properties, and it is commonly used in the conversion of gas volumes as well as pressures.

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As the metal scale will shrink as a result of the heat, making the measurement inaccurate, it would be too high.

The chemical reaction between potassium chloride and silver nitrate, in which solid silver chloride is precipitated out, is one of the greatest examples of precipitation reactions. This is the precipitation reaction's byproduct, the insoluble salt. Below is given the chemical equation for this precipitation process.

AgNO3(aqueous) + KCl(aqueous) → AgCl(precipitate) + KNO3(aqueous)

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Explanation:

We have a 63.9 g sample of calcium hydroxide. First we have to convert those grams into moles. To do that we have to use the molar mass of calcium hydroxide.

Calcium hydroxide = Ca(OH)₂

molar mass of Ca = 40.08 g/mol

molar mass of O = 16.00 g/mol

molar mass of H = 1.01 g/mol

molar mass of Ca(OH)₂ = 1 * 40.08 g/mol + 2 * 16.00 g/mol + 2 * 1.01 g/mol

molar mass of Ca(OH)₂ = 74.10 g/mol

mass of Ca(OH)₂ = 63.9 g

moles of Ca(OH)₂ = 63.9 g /(74.10 g/mol)

moles of Ca(OH)₂ = 0.862 moles

In 1 molecule of Ca we have 2 atoms of O. So in 1 mol of Ca(OH)₂ we will have 2 moles of O atoms.

1 mol of Ca(OH)₂ = 2 moles of O atoms

moles of O atoms = 0.862 moles of Ca(OH)₂ * 2 moles of O /1 mol of Ca(OH)₂

moles of O atoms = 1.724 moles

One mol is similar to a dozen. When we say that we need a dozen eggs we know that we need 12 eggs. If we want a mol of eggs, we want 6.022*10^23 eggs. So one mol of something is 6.022 * 10^23 of that.

1 mol of O atoms = 6.022 * 10^23 atoms

n° of O atoms = 1.724 moles * 6.022 * 10^23 atoms/1 mol

n° of O atoms = 1.04 * 10^24 atoms

Answer: In a 63.9 g sample of Ca(OH)₂ we have 1.04 *10^24 atoms of oxygen.

The speed of light through space is 300 million m/s .

There was a time when everybody thought that there is no limit for the speed at which an object can travel , but Einstein gave the limit which is the speed of light.

The speed of the light in vacuum travels at a speed of 300 million m/s .

Therefore The speed of light through space is 300 million m/s .

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The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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a. A chemical equation that describes the overall reaction is observing is Zn + CuSO₄ → Cu + ZnSO₄

b. Balanced half-reaction for the reaction happening at the anode: Zn → Zn²⁺ + 2e⁻

c. Balanced half-reaction for the reaction happening at the cathode: Cu²⁺ + 2e⁻ → Cu

To find the chemical equation and balanced half-reaction, we must  understand  the terms chemical equation, balanced half reaction, electrons, protons, anode and cathode.

Thus, the overall reaction is the sum of two half-reactions.

Your question is incomplete, but your full question can't be found. Thus, the answer is general answer based on the  given keywords.

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Answer:

It's simple substitution reaction and there is no balance for the equation. It's right written.

Explanation:

Answer:

Control your weight. Reduce the risk of disease. Stay in shape etc.

Explanation:

Answer:

Explanation:

According to Kinetic Molecular Theory, an increase in temperature will increase the average kinetic energy of the molecules. As the particles move faster, they will likely hit the edge of the container more often.

Answer:

1. They are made up of two or more Pure substances that are not chemically bonded together and appear non-uniform

Explanation:

edge2020 :)

Heterogenous mixtures are made up of two or more substances that are not chemically bounded together  and which appear non-uniform.

Heterogenous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.

As there are two or more phases present in heterogenous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.

Components of a heterogenous mixtures are distinctly visible . There are two types of heterogenous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.

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Answer:

280 kPa

Explanation:

P1V1 = P2V2

140 * 2.5 =  P2 * 1.25

P2 = 280 kPa

Answer:

they pull or push on objects without touching them

Explanation:

The ocular drug physostigmine inhibits acetylcholinesterase, the enzyme responsible for the hydrolysis of acetylcholine. The administration of physostigmine, an acetylcholinesterase inhibitor, would cause the pupil to constrict (miosis).

By inhibiting acetylcholinesterase, physostigmine increases the levels of acetylcholine in the synaptic cleft, leading to prolonged stimulation of cholinergic receptors.

This results in increased parasympathetic activity, which causes the circular muscle of the iris (known as the sphincter pupillae) to contract, leading to pupil constriction.

Acetylcholine plays a role in regulating the size of the pupil. The circular muscle of the iris, known as the sphincter pupillae, is under the control of the parasympathetic nervous system.

Stimulation of the parasympathetic nerves causes the sphincter pupillae to contract, resulting in pupil constriction (miosis).

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Answer:

21 ..........................

Answer:

21 neutrons

Explanation:

Answer:

6.4

Explanation:

Answer:

There are 4 significant figures.

Explanation:

The significant figures are underlined :

0 . 0 9 0 5 0

Product B because it has a lower energy level than Product C's transition state, which leads to Product C.

The series of reactions required to create a desired product are described by a reaction pathway. The distribution strategy for a product is determined by things like percentage yield. Atomic economics. reaction time. is a connected graph with chemical species as its nodes. If a reaction transfers material from one species to the other, an edge unites the two. An vector from reactant toward the product is depicted as the edge.

Energy, or ATP, is created by chemical reactions within our cells. All living things require energy to survive, and Adp would be a reactant that fuels a number of other chemical reactions inside cells. Cells generate energy through a process called cellular respiration.

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Answer

50 N

Explanation